Corrector for calendar clockworks



March 24, 1953 MEYER CORRECTOR FOR CALENDAR CLOCKWORKS Filed Aug. 7, 1951 Patented Mar. 24, 1953 UNITED STATES PATENT OFFKIE to F stoekcompany elsa S. A, Grenchen, Switzerland, a joint- :Application August 7, 1951, Serial No. 240,622 In Switzerland April 21, 1950 2 Claims. 1

This invention relates to calendar clocks and watches more especially of the type in which a date member such as a disc is formed with internal toothing in which an annular date member formed with internal toothing is driven by the clockwork.

It is more particularly concerned with a corrector serving for turning the date member independently from the motoric drive in order to adjust or correct it.

The corrector according to this invention has the form of an elastic double-armed lever adapted to be rocked or oscillated, the free end of one of the arms of said lever engaging the inner teeth of the date member.

I prefer forming one of the arms of the doublearmed lever as a spring and arranging its center point outside of the date member with one of its arms extending underneath said member.

In the drawings aflixed to this specification and forming part thereof an embodiment of this invention is illustrated diagrammatically by way of example.

In the drawings Fig. 1 is a plan view and Fig. 2 is a cross-section on the line A--B in Fig. 1.

Referring to the drawings I is the annular date member and 2B are some of its internal teeth which I intended to be marked l-3l. This date member is driven in a well-known manner by the motor (clockwork), through a gear I2 rotating at a speed of 1 revolution per day, by means of the driver I3 in such manner as to be imparted every day an angular movement equalling one pitch. Stopping in the position it occupies, is effected by an inner barrier 9/1! consisting of a roller 9 which is forced by a spring H into the gap between two teeth of the member it). Thus the disc or annulus I0 is turned counter to the action of the spring I I.

The corrector proper, i. e. the means enabling the date member to be turned through any desired angle independently of the motor drive, consists of a substantially triangular part 1 which together with the U-shaped part 4 of a spring fixed near one of the corners of the triangle is made integral with this spring. The free end of the spring 4 abuts against the pin 2 fixed to the bottom plate.

The corrector is sunk in an indenture of the plate and held in place by a screw 1 allowing it to be rotated. The triangular part 1 may be considered as a double-armed lever one arm of which (la) extends from the center point up to the lug 3 which is so bent upwardly that on the double lever being oscillated it will engage the inner toothing 8 of the date member In. The other arm lb of the lever, which serves for actuating the lever, extends from the center point to the trigger 5 which is formed by the downwardly bent border portion of the member I.

This arrangement enables the date member ID to turn above the corrector which is located in the indenture 14 of the base plate, merely the trigger 5 projecting beyond the circumference of the date member, while on the inner side the lug 3 can be brought to engage with the teeth 3 of the member Ill as above described.

In the operation of the corrector, when the trigger 5 is being forced inwards, the arm Ia will be oscillated together with the lug 3 clockwise counter to the action of the spring 4 abutting against the check 2. The lug 3 now meets a tooth of the member 8 and thereby turns the date member through a certain distance which is so chosen that the roller 9 of the inner barrier is just moved across the next following tooth and under the influence of the spring I l ends the rotation of the date member Ill by one pitch. On the trigger being released, the lever la is given by the spring A a counter-clockwise return movement, during which it abuts from the inside against the next following tooth and by carrying this tooth along causes the date member to effect a slight rearward movement, of the date member. The dimensions of the parts are so chosen that the rearward rotation of the date member is not sufficient for lifting the roller 9 of the inner barrier across the preceding tooth, so that after the lug 3 has lost contact with the respective tooth, the date member springs back into the position into which it was carried by the actuation of the trigger.

In this manner the date member can be advanced through one pitch by pressing on the trigger 5.

Another condition for this sequence of operations is that the resiliency of the spring section V 4 is greater by a certain amount than the resiliency of the spring H, for otherwise the lug 3 on its return movement would not be able to bring about the small return movement of the date member and the corrector would be stuck in its operative position.

The advantages offered by the device according to this invention consists more particularly therein that a large sized date member can be used, because the corrector also acts on the inner teeth which serve for driving the date member.

This is in contrast to the correctors hitherto known which require a separate driving connection or an exterior row of teeth on the date member.

Owing to the mounting of the entire corrector in an indenture of the base plate and to the lack of additional driving parts, a watch provided with the new corrector may be very thin.

I wish it to be understood that I do not desire to be limited to the details shown and described for obvious modifications will occur to a person skilled in the art.

I claim:

1. Corrector for calendar timepieces comprising in combination, a date-indicating ring formed as an internally toothed ring, a rigid corrector lever engaging the inner teeth of said ring, a spring integral with said lever counteracting such engagement of said lever and being arranged outside of the space enclosed by the internal teeth of said ring.

4 a 2. The device of claim 1, in which the center point of the lever is arranged outside of the toothed ring, one of its arms extending underneath said ring.

FRIEDRICH MEYER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 504,432 Grunberg Sept. 5, 1893 2,582,879 Meyer Jan. 15, 1952 FOREIGN PATENTS Number Country Date 153,882 Switzerland July 1, 1932 

